CN111077586A - Method and device for determining main oil and gas accumulation period of complex fault basin - Google Patents
Method and device for determining main oil and gas accumulation period of complex fault basin Download PDFInfo
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Abstract
The invention relates to a method and a device for determining a main oil-gas accumulation period of a complex fault basin, and belongs to the technical field of oil-gas exploration and development. The method is characterized in that a macroscopic geologic body is used as a basis, main source rocks of the complex fractured lake basin are determined through affinity analysis between the source rocks and crude oil, the hydrocarbon discharging period of the main source rocks is determined based on the source rocks by combining the relationship between retained hydrocarbon and the maximum pyrolysis temperature, and the main primary burial period of the complex fractured lake basin is determined according to the thermal evolution degree of the main source rocks in different geological periods. The whole process does not involve subjective factors, overcomes the defect that the existing method for determining the main oil and gas reserve period by adopting microscopic geological data improves the accuracy of the main reserve period.
Description
Technical Field
The invention relates to a method and a device for determining a main oil-gas accumulation period of a complex fault basin, and belongs to the technical field of oil-gas exploration and development.
Background
In recent years, with the continuous deepening of the fine oil and gas exploration degree, more and more explorators are not limited to the exploration theory of the source control theory any more, and how to realize the efficient exploration in complex fractured lakes and basins is the goal pursued by each oil company. Due to the complex collapse of the lake basin, the fracture development and various oil and gas transportation and gathering ways, how to determine the main transportation and gathering period of the oil and gas is very important. The collapsible lakes have a plurality of sets of hydrocarbon source rocks in the longitudinal direction, different secondary depressions are formed on the plane, the heterogeneity is strong, the distribution of some secondary depressions is limited, some secondary depressions are wide, hydrocarbon source rocks can be generated to deposit as long as the hydrocarbon source rocks reach a certain thermal evolution degree, in addition, the burying depths of the different secondary depressions among the collapsible lakes are different, the heterogeneity is strong, so a plurality of deposit periods can exist for different secondary depressions, and for one collapsible lake, when oil gas is concentrated into the deposit period, the main deposit period is formed. An important factor for restricting the oil-gas exploration of the complex fractured lake basin is the determination of the oil-gas accumulation period, how to determine the main oil-gas accumulation period of a region, and the oil-gas exploration can be carried out in a form of a clubface in combination with the development of fractures and the like.
In the conventional determination of the main oil and gas accumulation period, various methods exist, mainly including a fluid inclusion method, an isotope method, a reservoir asphalt method, a hydrocarbon source rock hydrocarbon generation and discharge method and the like, and the methods are various.
Each of these methods has been found to be limited and advantageous by careful carding. For example, the fluid inclusion method has the advantages that the period of oil and gas accumulation can be estimated through the uniform temperature of saline water inclusions accompanying hydrocarbons in reservoirs, the combination of data such as the burying history and the like, and the method has the disadvantages that a large amount of coring data is needed, whether a sample is representative or not is difficult to say, and in addition, the characteristics that the fluid inclusions in different reservoirs have large differences are found in the actual working process. How to judge the main oil and gas accumulation period of the complex broken lake basin becomes a problem in front of exploration families. Due to the development of a complex collapse lake basin transportation system, the development of sand bodies, fractures and unconformity surfaces, oil gas is discharged from hydrocarbon source rocks, and can be rapidly transported to a trap, and compared with the geological age (which usually takes millions of years as a basic time unit), the discharge of the oil gas can be regarded as instantaneous accumulation. Therefore, the research on the main oil and gas reservoir period of the complex fractured lake basin can be converted into the research on the hydrocarbon source rocks which mainly contribute to the oil and gas reservoir period of the complex fractured lake basin, and the large-scale hydrocarbon discharge period is the main reservoir period of the fractured lake basin.
In the prior art, a method for researching a multi-lateral heavy reservoir fluid inclusion body in a main oil and gas accumulation period can be used for determining the homogenization temperature of a saline water inclusion body associated with a hydrocarbon inclusion body in a laboratory to estimate the main oil and gas accumulation period, but the method is microscopic, the research coring data are limited, the representativeness of the sample of a researcher is difficult to convince, the determined main accumulation period is not accurate enough, and the subsequent oil and gas exploration work is influenced.
Disclosure of Invention
The invention aims to provide a method and a device for determining a main oil and gas accumulation period of a complex fault basin, and aims to solve the problem that the accuracy of the determined main accumulation period is low due to subjectivity during the determination of the current main accumulation period.
The invention provides a method for determining the main oil and gas accumulation period of a complex fault basin to solve the technical problem, which comprises the following steps:
1) obtaining the abundance and the retained hydrocarbons of various source rocks in a target area of the complex fault basin, and determining the main force source rock layer of the target area according to the effective source rock thickness of each layer in the target area;
2) determining a pyrolysis temperature interval corresponding to the hydrocarbon discharging period of the main force hydrocarbon source rock according to the determined layer position of the main force hydrocarbon source rock and the relation between the retained hydrocarbon in the main force hydrocarbon source rock of the layer position and the maximum pyrolysis temperature;
3) determining a vitrinite reflectivity interval corresponding to the hydrocarbon expulsion period of the main force hydrocarbon source rock according to the relation between the maximum pyrolysis temperature of the target area and the vitrinite reflectivity of the main force hydrocarbon source rock;
4) determining the distribution condition of the reflectivity of the vitrinite of the hydrocarbon source rock in target areas in different geological historical periods, and determining the area range of the vitrinite reflectivity interval corresponding to the hydrocarbon draining period of the main hydrocarbon source rock according to the distribution condition;
5) and comparing the region ranges of the vitrinite reflectivity intervals corresponding to the hydrocarbon expulsion periods of the main source rock in different geological history periods, and selecting the geological history period with the largest region range as the main oil and gas accumulation period of the target region.
The method is based on a macroscopic geologic body, analyzes parameters of various kinds of hydrocarbon source rocks of the Fengning to determine the main hydrocarbon source rock, and determines the large-scale hydrocarbon discharge period of the main hydrocarbon source rock by combining the retained hydrocarbon and the burial history data of the main hydrocarbon source rock on the basis of the main hydrocarbon source rock so as to determine the main oil-gas accumulation period of the basin of the fractured lake. In the whole process, microscopic data such as rock cores and the like do not need to be selected, so that artificial interference is avoided, the objectivity of the data is ensured, and the accuracy of determining the main accumulation period is improved.
In order to further improve the accuracy of the determined main pay-off period, the invention further provides a specific determination mode of the main force source rock horizon, and the determination process of the main force source rock horizon in the step 1) is as follows:
A. obtaining the abundance and the retained hydrocarbons of various kinds of source rocks, and determining the lower limit value of the abundance of the source rocks in the target area according to the relationship between the abundance and the retained hydrocarbons of the source rocks;
B. and determining effective development thicknesses of the source rocks of different layers in the target area according to the lower limit value of the abundance of the source rocks of the target area and the drilling data of the target area, and selecting the layer with the thickness of the source rocks larger than the set thickness as the main force source rock layer of the target area.
Further, the invention also provides a specific determination process of the pyrolysis temperature interval corresponding to the hydrocarbon discharge period, and the determination process of the pyrolysis temperature interval corresponding to the hydrocarbon discharge period of the dominant hydrocarbon source rock in the step 2) is as follows:
selecting the pyrolysis temperature when the retained hydrocarbon of the main force hydrocarbon source rock reaches the maximum value on the determined main force hydrocarbon source rock layer as the pyrolysis temperature corresponding to the hydrocarbon discharge starting period; selecting the pyrolysis temperature when the retained hydrocarbon of the main hydrocarbon source rock is reduced to a stable value as the pyrolysis temperature corresponding to the hydrocarbon discharge extinction period; and the pyrolysis temperature interval corresponding to the hydrocarbon discharge starting period and the hydrocarbon discharge extinction period is the pyrolysis temperature interval corresponding to the determined hydrocarbon discharge period.
Further, the invention also provides a specific determination mode of the vitrinite reflectivity distribution in different geological periods, and the step 4) is to determine the vitrinite reflectivity distribution condition of the dominant hydrocarbon source rock in different geological history periods according to the fitting relation between the vitrinite reflectivity and the longitudinal depth of the hydrocarbon source rock in the target area.
The invention also provides a device for determining the main oil and gas accumulation period of the complex fault trap basin, which comprises a processor, a memory and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the following steps when executing the computer program:
1) obtaining the abundance and the retained hydrocarbons of various source rocks in a target area of the complex fault basin, and determining the main force source rock layer of the target area according to the effective source rock thickness of each layer in the target area;
2) determining a pyrolysis temperature interval corresponding to the hydrocarbon discharging period of the main force hydrocarbon source rock according to the determined layer position of the main force hydrocarbon source rock and the relation between the retained hydrocarbon in the main force hydrocarbon source rock of the layer position and the maximum pyrolysis temperature;
3) determining a vitrinite reflectivity interval corresponding to the hydrocarbon expulsion period of the main force hydrocarbon source rock according to the relation between the maximum pyrolysis temperature of the target area and the vitrinite reflectivity of the main force hydrocarbon source rock;
4) determining the distribution condition of the reflectivity of the vitrinite of the hydrocarbon source rock in target areas in different geological historical periods, and determining the area range of the vitrinite reflectivity interval corresponding to the hydrocarbon draining period of the main hydrocarbon source rock according to the distribution condition;
5) and comparing the region ranges of the vitrinite reflectivity intervals corresponding to the hydrocarbon expulsion periods of the main source rock in different geological history periods, and selecting the geological history period with the largest region range as the main oil and gas accumulation period of the target region.
According to the method, microcosmic data such as the rock core and the like are not required to be selected, so that man-made interference is avoided, the objectivity of the data is guaranteed, and the accuracy of determining the main accumulation period is improved.
In order to further improve the accuracy of the determined main pay-off period, the invention further provides a specific determination mode of the main force source rock horizon, and the determination process of the main force source rock horizon in the step 1) is as follows:
A. obtaining the abundance and the retained hydrocarbons of various kinds of source rocks, and determining the lower limit value of the abundance of the source rocks in the target area according to the relationship between the abundance and the retained hydrocarbons of the source rocks;
B. and determining effective development thicknesses of the source rocks of different layers in the target area according to the lower limit value of the abundance of the source rocks of the target area and the drilling data of the target area, and selecting the layer with the thickness of the source rocks larger than the set thickness as the main force source rock layer of the target area.
Further, the invention also provides a specific determination process of the pyrolysis temperature interval corresponding to the hydrocarbon discharge period, and the determination process of the pyrolysis temperature interval corresponding to the hydrocarbon discharge period of the dominant hydrocarbon source rock in the step 2) is as follows:
selecting the pyrolysis temperature when the retained hydrocarbon of the main force hydrocarbon source rock reaches the maximum value on the determined main force hydrocarbon source rock layer as the pyrolysis temperature corresponding to the hydrocarbon discharge starting period; selecting the pyrolysis temperature when the retained hydrocarbon of the main hydrocarbon source rock is reduced to a stable value as the pyrolysis temperature corresponding to the hydrocarbon discharge extinction period; and the pyrolysis temperature interval corresponding to the hydrocarbon discharge starting period and the hydrocarbon discharge extinction period is the pyrolysis temperature interval corresponding to the determined hydrocarbon discharge period.
Further, the invention also provides a specific determination mode of the vitrinite reflectivity distribution in different geological periods, and the step 4) is to determine the vitrinite reflectivity distribution condition of the dominant hydrocarbon source rock in different geological history periods according to the fitting relation between the vitrinite reflectivity and the longitudinal depth of the hydrocarbon source rock in the target area.
Drawings
FIG. 1 is a flow chart of a complex fault basin hydrocarbon main accumulation period determination method of the present invention;
FIG. 2 is a plate for determining the lower limit of abundance of a depressed effective source rock according to an embodiment of the method of the present invention;
FIG. 3 is a profile of a depressed dominant source rock development horizon in an embodiment of a method of the invention;
FIG. 4 is a graph of maximum pyrolysis temperature of a depressed dominant source rock versus hydrocarbon retention for an example of a process of the present invention;
FIG. 5 is a graph of the reflectivity of a vitrinite body of a depressed main force hydrocarbon source rock according to an embodiment of the method of the invention;
FIG. 6-a is a contour map of a vitrinite reflectivity plane at the end of three segments of a depressed main force hydrocarbon source rock sand in an embodiment of the method of the invention;
FIG. 6-b is a contour map of the vitrinite reflectivity plane at the end of the second section of a depressed dominant hydrocarbon source rock sand in an embodiment of the method of the present invention;
FIG. 6-c is a contour map of the mirror body reflectivity plane at the end of a period of a depressed main force source rock sand in an embodiment of the method of the present invention;
FIG. 6-d is a contour map of the reflectivity plane of a medium-term vitrinite body of a depressed main power hydrocarbon source rock east-nutrient group in the embodiment of the method;
FIG. 6-e is a contour map of a mirror body reflectivity plane at the end of a pottery group of a depressed main hydrocarbon source library in an embodiment of the method of the invention;
FIG. 6-f is a contour plot of the reflectivity of a mirror body of a depressed main force hydrocarbon source rock according to an embodiment of the method of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The invention discloses an embodiment of a method for determining a main oil and gas accumulation period of a complex fault basin.
The method is based on a macroscopic geologic body, determines the main source rocks of the complex fractured lake basin through the affinity analysis between the source rocks and crude oil, determines the hydrocarbon generation and drainage period of the main source rocks on the basis of the source rocks by combining the relationship between the retained hydrocarbon and the maximum pyrolysis temperature, and determines the main integral reservoir period of the complex fractured lake basin according to the thermal evolution degree of the main source rocks in different geological periods. The implementation process of the method is shown in figure 1, and the specific implementation mode of the method is explained in detail below by taking a pit of a certain basin in China as an example, the pit is a complex fractured basin, and has multi-stage fracture development, secondary fractures accompanied by main fractures at all stages are more developed, and due to the high-frequency oscillation characteristic of the lake basin, fractures, sand bodies and unconformity surfaces develop, and an oil and gas transmission and guide path is smooth. The specific implementation flow is as follows.
1. And determining the main force hydrocarbon source rock of the target area.
1.1 determining the effective hydrocarbon source rock abundance lower limit value.
And (3) measuring parameters such as the abundance TOC of various hydrocarbon source rocks and the retained hydrocarbon S1 in the target area, fitting the relationship between the TOC values of various hydrocarbon source rocks in the research area and the retained hydrocarbon S1 corresponding to the TOC values, establishing a relationship chart, and when the slope of the TOC and the retained hydrocarbon S1 in the chart has an inflection point, determining the TOC value corresponding to the inflection point, namely the lower limit value of the abundance of the effective hydrocarbon source rocks in the target area.
According to the abundance parameter TOC of the hydrocarbon source rock in the depressed area and the retention parameter S1 of the hydrocarbon source rock in the depressed area in the embodiment, the hydrocarbon source rock with the TOC of more than 1.0% of the east depressed hydrocarbon source rock is determined to have the hydrocarbon expulsion characteristic, when the TOC is less than 1.0%, the change relationship between the retained hydrocarbon S1 and the TOC is not obvious, the slope is flat, when the TOC is more than 1.0%, the change relationship between the retained hydrocarbon S1 and the TOC is obvious, the slope is steep, which indicates that the change relationship is a main contributor of oil and gas accumulation, and the TOC value corresponding to the inflection point is the lower limit value of the TOC of the east depressed hydrocarbon source rock (as shown in fig. 2), so that the lower limit value of the abundance of the east depressed hydrocarbon source rock is determined to be 1.0%.
1.2 determining a main force hydrocarbon source rock development horizon.
And (3) counting the thickness of the effective source rock of each layer by using the lower limit value of the abundance of the effective source rock determined in the step 1.1 and then using a large amount of drilling data of the target area, wherein the layer with larger thickness of the effective source rock is called as a main force source rock development layer of the target position.
According to the lower limit value of the effective hydrocarbon source rock TOC (TOC > 1.0%) of the depressed area and a large amount of drilling data of the target area in the embodiment, the effective hydrocarbon source rock development thickness of different layers of the east Purporage is established (as shown in figure 3), wherein the effective hydrocarbon source rock thickness of the sand three upper is 18m, the effective hydrocarbon source rock thickness of the sand three middle is 26m, the effective hydrocarbon source rock thickness of the sand three middle is 37m, the sand three lower is 95m, and the sand four upper is 134m, and compared with the main force hydrocarbon source rock thickness of each layer, the main force hydrocarbon source rocks of the depressed sand three lower and the sand four upper are found to be developed relatively, and the main force hydrocarbon source rock of the depressed sand three lower and the sand four upper layers is determined as the sand three lower-sand four upper layers due to continuous.
2. And determining the vitrinite reflectivity corresponding to the large-scale hydrocarbon discharge period of the main force source rock.
2.1 determining the relation of the retained hydrocarbon S1-Tmax of the main force hydrocarbon source rock.
And (3) determining the development position of the main force hydrocarbon source rock by using the step 1.2, and determining the large-scale hydrocarbon discharge period of the main force hydrocarbon source rock according to the S1-Tmax relation of the main force hydrocarbon source rock of the position. In the geologic body context, the main hydrocarbon source rock retention hydrocarbons S1 generally have a gradual increase with increasing depth of burial, and when a peak is reached, the hydrocarbon source rock retention hydrocarbons are considered to reach a maximum value, and the corresponding pyrolysis temperature is Tmax, which is considered to be the beginning period of the main hydrocarbon expulsion period (abbreviated as T1); then, with the increase of the buried depth and the increase of the overlying gravity, the retained hydrocarbon S1 is gradually reduced, when the buried depth is reduced to a constant plateau period, the value of the retained hydrocarbon S1 is gradually stabilized, the hydrocarbon elimination period is considered, and the corresponding temperature is T2; the interval between T1 and T2 was identified as the pyrolysis temperature interval corresponding to the main hydrocarbon expulsion period.
For the embodiment, the relation of the retained hydrocarbons S1-Tmax of the principal source rock is determined as shown in fig. 4, as can be seen from fig. 4, the maximum value of S1 is 6, and the corresponding temperature is 435 ℃, when the temperature is abbreviated as T1, that is, T1 is 435 ℃, then S1 is in a decreasing trend along with the increase of Tmax, when the temperature is 450 ℃, the values of the retained hydrocarbons S1 are gradually steady and are all less than 2, and a constant plateau period (0-2) is entered, when the constant plateau period is considered as a hydrocarbon expulsion extinction period, when the corresponding temperature is abbreviated as T2; i.e., T2-450 ℃, the interval between T1 and T2 (435-.
2.2 determining vitrinite reflectance Ro1 and Ro2 values corresponding to the main force source rock by utilizing the T1 and T2 values respectively.
And (3) respectively determining vitrinite reflectivity Ro1 and Ro2 values corresponding to the main force source rock by utilizing the T1 and T2 values of the hydrocarbon expulsion period of the main force source rock determined in the step 2.1 and a fitting relation formula between the Tmax value of the target area and the vitrinite reflectivity Ro of the main force source rock.
In this embodiment, according to the correspondence between the Tmax values of a large number of recessed source rocks and Ro, it is determined that the vitrinite reflectance Ro1 corresponding to 435 ℃ of the source rock T1 is 0.7%, and the vitrinite reflectance Ro2 corresponding to 450 ℃ of the source rock T2 is 1.0%.
3. And determining the distribution of Ro1 and Ro2 of the main force source rock in different geological periods.
3.1 determining a plane Ro contour map of the main force hydrocarbon source rock in different geological history periods according to the fitting relation between the reflectivity Ro of the vitrinite of the hydrocarbon source rock in the target area and the longitudinal depth y.
For the embodiment, the fitting relation of the reflectivity Ro of the source rock vitrinite in the target area and the longitudinal depth y is shown in fig. 5, wherein y is 1684.8ln (Ro) +3582.9, and according to the relation, the contour map of the Ro on the plane of the source rock sanddown-sandup in different geological history periods is determined.
3.2 determining the area ranges corresponding to Ro1 and Ro2 on the Ro contour map of different geological history periods.
The present example illustrates that the vitrinite reflectance Ro1 and Ro2 values of 0.7% and 1.0% respectively corresponding to the dominant source rock determined in step 2.2 depict areas determined for both different geologic history periods (as shown in fig. 6-a, 6-b, 6-c, 6-d, 6-e, and 6-f).
4. And determining the area range of the vitrinite reflectivity interval corresponding to the hydrocarbon expulsion period of the main force hydrocarbon source rock.
Comparing the regional ranges corresponding to Ro1 and Ro2 in different periods, wherein the difference between the comparisons indicates that the maximum regional range period corresponding to Ro1 and Ro2 is the main hydrocarbon discharge period of the main hydrocarbon source rock, and the main hydrocarbon accumulation period of the complex fault basin oil gas can also be considered.
For the present embodiment, the regions Ro1 and Ro2 defined by the third sand end, the second sand end, the first sand end, the middle east camp group, the last libido group and the present time of the main source rock sand are 0.7% and 1.0% respectively, as shown in fig. 6-a, 6-b, 6-c, 6-d, 6-e and 6-f, the regions Ro at the third sand end are mainly concentrated between 0.5 and 0.7%, the regions Ro at the third sand end of the main source rock sand are not yet in the large hydrocarbon generation and expulsion period, the regions Ro at the equivalent part of the second sand end are mainly concentrated between 0.7 and 1.0%, the hydrocarbon generation and expulsion period is started, the majority of regions Ro at the last sand end are mainly concentrated between 0.7 and 1.0%, the hydrocarbon expulsion period is started, the majority of the regions Ro at the middle east camp is greater than 1.0%, and the hydrocarbon expulsion period is over, the Ro area is more than 1.3% in the terminal stage of the Librarian pottery group and most of the areas nowadays, and the hydrocarbon generation and discharge period is finished. From this, it can be judged that the depressed primary accumulation period in the present embodiment is the sand two end period-sand one end period.
Embodiment of device for determining main oil and gas accumulation period of complex fault basin
The invention discloses a device for determining the main oil and gas accumulation period of a complex fault basin, which is a computer or other equipment with data processing capacity, and comprises: memory, processor and network module. The memory, processor, and network module are electrically connected to each other, directly or indirectly, to enable transmission or interaction of data. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The memory comprises at least one software functional module which can be stored in the memory in the form of software or firmware (firmware), and the processor executes various functional applications and data processing by running the software programs and the modules stored in the memory, namely, the method for determining the main oil and gas accumulation period of the complex fault trap basin in the embodiment of the method is realized.
The Memory may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory is used for storing programs, and the processor executes the programs after receiving the execution instructions.
The processor may be an integrated circuit chip having signal processing capabilities. The processor may be a general-purpose processor including a Central Processing Unit (CPU), a Network Processor (NP), and the like. But may also be a Digital Signal Processor (DSP)), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The various methods, steps and logic blocks disclosed in embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The network module is used for establishing communication connection between the electronic equipment and an external communication terminal through a network, and realizing the transceiving operation of network signals and data. The network signal may include a wireless signal or a wired signal.
The method is based on a macroscopic geologic body, determines the main hydrocarbon source rock of the complex fractured lake basin through the affinity analysis between the hydrocarbon source rock and crude oil, determines the hydrocarbon generation and discharge period of the main hydrocarbon source rock in a large amount by combining the relationship between the retained hydrocarbon and the maximum pyrolysis temperature on the basis of the hydrocarbon source rock, and determines the main burial period of the complex fractured lake basin according to the thermal evolution degree of the main hydrocarbon source rock in different geological periods, thereby overcoming the defect of great manmade nature caused by judging the complex fractured lake basin by using microscopic data in the prior art and improving the accuracy of the main burial period.
Claims (8)
1. A method for determining a main oil and gas accumulation period of a complex fault basin is characterized by comprising the following steps:
1) obtaining the abundance and the retained hydrocarbons of various source rocks in a target area of the complex fault basin, and determining the main force source rock layer of the target area according to the effective source rock thickness of each layer in the target area;
2) determining a pyrolysis temperature interval corresponding to the hydrocarbon discharging period of the main force hydrocarbon source rock according to the determined layer position of the main force hydrocarbon source rock and the relation between the retained hydrocarbon in the main force hydrocarbon source rock of the layer position and the maximum pyrolysis temperature;
3) determining a vitrinite reflectivity interval corresponding to the hydrocarbon expulsion period of the main force hydrocarbon source rock according to the relation between the maximum pyrolysis temperature of the target area and the vitrinite reflectivity of the main force hydrocarbon source rock;
4) determining the distribution condition of the reflectivity of the vitrinite of the hydrocarbon source rock in target areas in different geological historical periods, and determining the area range of the vitrinite reflectivity interval corresponding to the hydrocarbon draining period of the main hydrocarbon source rock according to the distribution condition;
5) and comparing the region ranges of the vitrinite reflectivity intervals corresponding to the hydrocarbon expulsion periods of the main source rock in different geological history periods, and selecting the geological history period with the largest region range as the main oil and gas accumulation period of the target region.
2. The method for determining the main hydrocarbon reservoir period in the complex fault basin according to claim 1, wherein the determination process of the main hydrocarbon source rock horizon in the step 1) is as follows:
A. obtaining the abundance and the retained hydrocarbons of various kinds of source rocks, and determining the lower limit value of the abundance of the source rocks in the target area according to the relationship between the abundance and the retained hydrocarbons of the source rocks;
B. and determining effective development thicknesses of the source rocks of different layers in the target area according to the lower limit value of the abundance of the source rocks of the target area and the drilling data of the target area, and selecting the layer with the thickness of the source rocks larger than the set thickness as the main force source rock layer of the target area.
3. The method for determining the main hydrocarbon accumulation period of the complex trap basin according to claim 1, wherein the pyrolysis temperature interval corresponding to the hydrocarbon expulsion period of the main hydrocarbon source rock in the step 2) is determined as follows:
selecting the pyrolysis temperature when the retained hydrocarbon of the main force hydrocarbon source rock reaches the maximum value on the determined main force hydrocarbon source rock layer as the pyrolysis temperature corresponding to the hydrocarbon discharge starting period; selecting the pyrolysis temperature when the retained hydrocarbon of the main hydrocarbon source rock is reduced to a stable value as the pyrolysis temperature corresponding to the hydrocarbon discharge extinction period; and the pyrolysis temperature interval corresponding to the hydrocarbon discharge starting period and the hydrocarbon discharge extinction period is the pyrolysis temperature interval corresponding to the determined hydrocarbon discharge period.
4. The method for determining the main hydrocarbon reservoir period in the complex fault trap basin according to claim 1, wherein the step 4) is to determine the vitrinite reflectivity distribution of the dominant hydrocarbon source rock in different geological history periods according to the fitting relation between the vitrinite reflectivity and the longitudinal depth of the hydrocarbon source rock in the target area.
5. An apparatus for determining a major pay-off period for hydrocarbons in a complex fault basin, the apparatus comprising a processor and a memory and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
1) obtaining the abundance and the retained hydrocarbons of various source rocks in a target area of the complex fault basin, and determining the main force source rock layer of the target area according to the effective source rock thickness of each layer in the target area;
2) determining a pyrolysis temperature interval corresponding to the hydrocarbon discharging period of the main force hydrocarbon source rock according to the determined layer position of the main force hydrocarbon source rock and the relation between the retained hydrocarbon in the main force hydrocarbon source rock of the layer position and the maximum pyrolysis temperature;
3) determining a vitrinite reflectivity interval corresponding to the hydrocarbon expulsion period of the main force hydrocarbon source rock according to the relation between the maximum pyrolysis temperature of the target area and the vitrinite reflectivity of the main force hydrocarbon source rock;
4) determining the distribution condition of the reflectivity of the vitrinite of the hydrocarbon source rock in target areas in different geological historical periods, and determining the area range of the vitrinite reflectivity interval corresponding to the hydrocarbon draining period of the main hydrocarbon source rock according to the distribution condition;
5) and comparing the region ranges of the vitrinite reflectivity intervals corresponding to the hydrocarbon expulsion periods of the main source rock in different geological history periods, and selecting the geological history period with the largest region range as the main oil and gas accumulation period of the target region.
6. The device for determining the main hydrocarbon accumulation period of the complex fault basin according to claim 5, wherein the determination process of the main hydrocarbon source rock horizon in the step 1) is as follows:
A. obtaining the abundance and the retained hydrocarbons of various kinds of source rocks, and determining the lower limit value of the abundance of the source rocks in the target area according to the relationship between the abundance and the retained hydrocarbons of the source rocks;
B. and determining effective development thicknesses of the source rocks of different layers in the target area according to the lower limit value of the abundance of the source rocks of the target area and the drilling data of the target area, and selecting the layer with the thickness of the source rocks larger than the set thickness as the main force source rock layer of the target area.
7. The device for determining the main hydrocarbon accumulation period of the complex trap basin according to claim 5, wherein the pyrolysis temperature interval corresponding to the hydrocarbon expulsion period of the main hydrocarbon source rock in the step 2) is determined as follows:
selecting the pyrolysis temperature when the retained hydrocarbon of the main force hydrocarbon source rock reaches the maximum value on the determined main force hydrocarbon source rock layer as the pyrolysis temperature corresponding to the hydrocarbon discharge starting period; selecting the pyrolysis temperature when the retained hydrocarbon of the main hydrocarbon source rock is reduced to a stable value as the pyrolysis temperature corresponding to the hydrocarbon discharge extinction period; and the pyrolysis temperature interval corresponding to the hydrocarbon discharge starting period and the hydrocarbon discharge extinction period is the pyrolysis temperature interval corresponding to the determined hydrocarbon discharge period.
8. The device for determining the main hydrocarbon accumulation period of the complex fault trap basin according to claim 5, wherein the step 4) is to determine the vitrinite reflectivity distribution of the main hydrocarbon source rock in different geological history periods according to the fitting relation of the vitrinite reflectivity and the longitudinal depth of the hydrocarbon source rock in the target area.
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